František Adamčík

Application of linearized Kalman filter in integration of navigation systems

This contribution presents an analysis and application of Kalman filtering in the field of autonomous and satellite navigation integration for a flying object. This paper deals with properties of the linearized Kalman filter, applied error models and test functionality of the proposed algorithm. An issue of the used and analyzed error models is related with analysis of the sensor properties. Errors for particular inertial measurement units are selected and their implementation to error model of Kalman filter is evaluated. Error characteristics is followed by the analyzed error models for navigation system integration. The article presents a partial solution of dissertation thesis “Integration architectures of navigation systems”, where analysis of Kalman filter leads to proposal of the integrated navigation system for UAV (Unmanned Aerial Vehicle).

Effect of TBC on heat transfer into nickel based refractory alloy

The aim of the experiment is to evaluate an effect of industrially used plasma sprayed coatings of the TBC on the heat transfer into the refractory material designed for aeronautical applications. This study uses basic structural material of combustion chambers — components of turbine engines highly thermally stressed during the operation by flow of hot gasses. Using the hot gasses from the gas burner, the operational conditions inside the combustion chambers are simulated. The use of the TBC coating shows positive effect on the alloy overheating reduction. The results demonstrated decrease of the temperature with values in the range of hundreds of °C for materials covered with the TBC. This phenomenon can contribute to the development of the new types of aircraft engines with higher operational temperature and better fuel economics.

Applied Algorithmization in Optimization of Airport Processes Simulation Models

The authors of this contribution are dealing with the potential of applied algorithmization as a methodology of improving efficiency and accelerating the process of designing as well as program implementation of simulation models for the purpose of computer-based modeling and simulation of airport processes. At this simulation, quality is built upon on a precisely defined model of airport processes are set forth by the authors as part of the process of designing a modern Departure Control System (DCS) of airports, which currently designated for automation of a complex management of processes in the field of passenger and baggage handling, the airports offer to individual air carriers. The resulting algorithms designed for the separate separate processes of the DCS will help the authors understand real processes taking place at the airport with the aim to optimize the course of actions at the airport operation. A precisely built model of airport processes is the prerequisite of proper implementation of the simulation, pointing out both the advantages and disadvantages of this models and their implementation in practice.

The Application of Online Check-in in the Process of Passenger Handling in Air Transportation

Passenger handling is one of the most important activities any passenger is obliged to carry out prior to boarding the plane to depart. For the handling process to be safeguarded, it is inevitable to perform the services involved in it fast and efficiently so as to prevent idle times or delays during the procedures potentially resulting in delay of flight. By gradual development of the so-called web-based information technologies, some of the activities involved in the handling process can be delegated to the passengers themselves, thereby achieving a faster course of the passenger handling process. In this contribution the authors are dealing with the status quo of the on-line web-based check-in process in air transportation forecasting the expected course of events in these services in the future. Next, based on analyzing functions and characteristics of similar solutions available in the market, the authors are putting forward their new proposal of their own design of a self-service, on-line system of passenger handling with the aim to simplify and expedite the entire handling process. It is the aim of the authors to develop a competitive design in terms of costs as well as new function and services not offered by the hitherto existing with emphasis on improving efficiency of passenger handling at the airports. The resulting solution thanks to internet based technologies is platform independent and fully applicable to the process of airport passenger handling. To an equal extent, the solutions are being applied by the authors to the educational process, as a training tool for the preparation of the aviation personnel and also as part of simulation models for research in the field of airport processes optimization.

Hibridan diagnostički sustav za male turbomlazne strojeve

A diagnostic system is one of the key components securing the safety of operation of a turbojet engine. There are many different engineering approaches how to design engine diagnostic systems applied in real-world conditions. We propose a novel approach for a diagnostic system design to be applied on the object of a small turbojet engine using thermal diagnostics combined with a more traditional model based approach. The combination of these two approaches together with application of methods from the area of computational intelligence create a hybrid diagnostic system, which can be integrated with a control system of the engine. The article also deals with experimental validation of the designed diagnostic system on the object of a small turbojet engine iSTC-21v in laboratory conditions.

Geometric dilution of precision of the GNSS for Mars (GNSS FATIMA)

Positioning on Mars is one of the critical aspects of every planetary mission. Current complex planetary exploration systems (orbital and surface) rely on complex navigation and positioning systems, which make these systems complicated, expensive and their missions dangerous. The project of the global navigation satellite system for Mars (proposed system name – FATIMA) can make this and even future manned missions more safe, less expensive and the whole positioning in real time more reliable. The GNSS can be used by more systems or users simultaneously. In this research paper we focus on possible positioning errors when such a system is used. This research is focused on the GDOP – Geometric Dilution of Precision as one of the main factors influencing the GNSS.

Analysis of GPS satellites position determination using MATLAB ® environment

Content of this contribution is a MATLAB solution of GPS satellite position evaluation based on generated navigation messages of the satellites. Article is focused on issues of the navigation message information content, ephemeris and data processing for evaluation of the Cartesian and spherical satellite constellation. Except analysis of mathematical solutions, the focus is on the position visualization using MATLAB environment. The issue of satellite position and estimation of the ground object position is closely linked with research of navigation architectures for autonomous and satellite navigation systems on Department of Avionics, Faculty of Aeronautics in Kosice. Given MATLAB solution, which is described in this article, is used for education and also as the basic simulation tool for more complex research of Unmanned Aerial Vehicles (UAV) navigation.

Diagnostics of complex systems using thermography

Aim of this paper is to discuss possible method, applicable to diagnostics of complex thermodynamic systems, in our case, the small turbojet engine. Our motivation is based on the fact that, the development of utility properties of aviation technologies, its improvement i.e. accessibility to users cannot be done without detailed observation and tests. In aircraft engine design, 40% of the problems are solved by testing. Therefore the financial cost of the product testing significantly affects the economy of the design development, e.g. production of an aircraft engine. The economy problem of a product placement on the market deepens, if the time and energy consumption is considered. For this reason, reducing the price and time, which significantly affects the output application effect, is a task solvable only by rationalization and organization of testing procedures. When accepting these conditions, one of the possible methods of control of a small turbo jet engine is the utilization of thermography. In order to utilize the thermography to diagnose the engine, multiple processing steps are necessary. These steps include thermal image inference correction, image preprocessing, segmentation and correlation analysis. We discuss these steps further in the paper, with main aim on the image inference correction.

Elimination of Dynamic Errors of Thermocouples in Aircraft Engines Using Neural Networks

The article is focused on diagnostics in the field of aviation turbo-jet engines. Evaluation of their technical status, and potential failures and pre-failure processes can be improved by monitoring their thermally loaded components. Part of the research in the given area also involves mathematical modeling of the channel measuring the exhaust gases temperature, using neural networks to compensate for dynamic errors of slow thermocouples used in such measurements.

Modeling of the measurement channel of outlet gases of the aviation engine using neural networks

The article is focused on diagnostics in the field of aviation turbo-jet engines. Evaluation of their technical status, and potential failures and pre-failure processes can be improved by monitoring their thermally loaded components. Part of the research in the given area also involves mathematical modeling of the channel measuring the exhaust gases temperature, using neural networks to compensate for dynamic errors of slow thermocouples used in such measurements.